My 69 Impala survivor has a 6" j bolt with a perfect wing nut, no rust, nice and shiny and my Z has a set up just like rszmjt's. I think the difference between the 2 vehicles is the angle of the trunk floor where the wheel and tire lays and the placement of the welded loop. There is a lot of space under the rim in the Camaro and in the Impala the rim sits pretty flat. The longer one definitely wouldn't work for the Impala.